Io Hvac Controls MD-3020 Zone Damper 30x20 in Belimo 3 Wire

Product Description

The IO HVAC CONTROLS MD-3020 is a rectangular two-position zone damper designed for use in forced-air HVAC zoning systems. Measuring 30 inches wide by 20 inches tall, this damper controls airflow through a duct zone by opening or closing on command from a zone controller or thermostat. It ships with a Belimo three-wire actuator, which provides reliable on/off positioning and draws low-voltage control signals from standard zoning panels. Weighing 18 pounds, the MD-3020 is a substantial, duct-grade assembly suited for residential and light-commercial applications where accurate zone control and durable actuation are required.

This damper is intended for installation in rectangular supply or return duct systems as part of a multi-zone forced-air HVAC setup. The Belimo three-wire actuator configuration is compatible with most two-position zone controllers that output a standard low-voltage signal, making it a practical choice for new zoning installations or replacement of failed damper assemblies in existing systems. HVAC technicians and sheet metal contractors are the primary installers for this type of equipment.

Key Features

• 30 x 20 inch rectangular damper body fits standard large-duct zoning applications
• Belimo three-wire actuator included for reliable two-position open/close operation
• Low-voltage actuator control integrates with most standard zoning panels and controllers
• 18-pound assembly built for durable duct-mounted service
• Two-position design simplifies wiring and control logic compared to modulating dampers

Compatibility

Designed as an OEM-style zone damper replacement or new-install component for rectangular duct systems requiring two-position airflow control with a Belimo three-wire actuator interface.

Installation Notes

Installation should be performed by a licensed HVAC technician or qualified sheet metal contractor. Shut down the air handler and de-energize the zone control panel before mounting the damper or connecting the actuator wiring. Verify that the duct opening matches the damper face dimensions and that the actuator wiring corresponds to the zone controller's output terminals per the controller manufacturer's wiring diagram. Follow applicable local mechanical codes and manufacturer instructions for damper orientation and airflow direction.